code: def test_3_dump_features(self):
      df = D.features(self.STOCK_NAMES, self.QLIB_FIELDS)
      TestDumpData.SIMPLE_DATA = df.loc(axis=0)[self.STOCK_NAMES[0], :]
      self.assertFalse(df.dropna().empty, "features data failed")
      self.assertListEqual(
          list(df.columns), self.QLIB_FIELDS, "features columns failed"
      )
  
file_path: qlib/tests/test_dump_data.py
imports: import sys
  import shutil
  import unittest
  from pathlib import Path
  import qlib
  import numpy
  import pandas
  from qlib.data import D
  from get_data import GetData
  from dump_bin import DumpDataAll, DumpDataFix
label_desc: Use image node_id 6 for calling the TestDumpData obj's underlying member method code with example usage: obj.test_3_dump_features() without return types